You who have iman! when you get up to do salat, wash your faces and your hands and your arms to the elbows, and wipe over your heads, and wash your feet to the ankles. If you are in a state of major impurity, then purify yourselves. But if you are ill or on a journey, or have come from the lavatory, or have touched women, and cannot find any water, then do tayammum with pure earth, and wipe your faces and your hands. Allah does not want to make things difficult for you, but He does want to purify you and to perfect His blessing upon you so that hopefully you will be thankful.